XY Problem detected: You’re asking about your attempted solution rather than your actual problem. This leads to enormous amounts of wasted time and energy, both on the part of people asking for help, and on the part of those providing help.
I used to have an ASUS EeeBook X205TA netbook with 2GB RAM. The kernel didn’t make any difference as far as performance.
No, sorry. 3.18 has been EOL (End Of Life) since 2017. As already mentioned, the current supported kernels are mention in every Announcements post.
Then please create a new support thread regarding that subject. Before you do, please see: